Dont expect setmulti is faster then multiple SETs!It doesn't use the setmulti lib function, it iterats over every key and send him alone.I can't find any php implementation with setmulti support (needs support for memcached's binary protocol, remember php's "memcache"-extension only supports text-protocol).Thats bad, not enought throughput to membase.So i have to use redis instead, coz of its support for get/set multi.